Disable crashing calls on Wayland

[tsujan]

They are screen locking before suspend and reloading the settings of lxqt-config-monitor

Fixes #457 and is related to lxqt/lxqt-config#916

[stefonarch]

There's something: on suspend/resume lxqt-powermanagement crashes (and is restarted):

mar 18 07:00:44 systemd-logind[438]: Suspending...
mar 18 07:00:44 systemd[1]: systemd-coredump@29-594080-0.service: Deactivated successfully.
mar 18 07:00:44 systemd-coredump[594081]: [🡕] Process 592821 (lxqt-powermanag) of user 1000 dumped core.
                                          
                                          Stack trace of thread 592821:
                                          #0  0x00007f9eac7b2719 _ZN4LXQt18ScreenSaverPrivate19isScreenSaverLockedEv (liblxqt.so.1 + 0x49719)
                                          #1  0x00007f9eac7b2d8c _ZN4LXQt11ScreenSaver10lockScreenEv (liblxqt.so.1 + 0x49d8c)
                                          #2  0x0000560bc1385e42 n/a (lxqt-powermanagement + 0xee42)
                                          #3  0x00007f9eab2bea71 n/a (libQt5Core.so.5 + 0x2bea71)
                                          #4  0x0000560bc1382a14 n/a (lxqt-powermanagement + 0xba14)
                                          #5  0x0000560bc138387f n/a (lxqt-powermanagement + 0xc87f)
                                          #6  0x00007f9eac54c45f n/a (libQt5DBus.so.5 + 0x6145f)
                                          #7  0x00007f9eab2b1bb0 _ZN7QObject5eventEP6QEvent (libQt5Core.so.5 + 0x2b1bb0)
                                          #8  0x00007f9eabf78b5c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5 + 0x178b5c)
                                          #9  0x00007f9eab28df48 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 + 0x28df48)
                                          #10 0x00007f9eab28ea53 _ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData (libQt5Core.so.5 + 0x28ea53)
                                          #11 0x00007f9eab2d4e88 n/a (libQt5Core.so.5 + 0x2d4e88)
                                          #12 0x00007f9eaa928afb g_main_context_dispatch (libglib-2.0.so.0 + 0x5aafb)
                                          #13 0x00007f9eaa9855d9 n/a (libglib-2.0.so.0 + 0xb75d9)
                                          #14 0x00007f9eaa926382 g_main_context_iteration (libglib-2.0.so.0 + 0x58382)
                                          #15 0x00007f9eab2d8c6c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d8c6c)
                                          #16 0x00007f9eab2866ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2866ec)
                                          #17 0x00007f9eab291219 _ZN16QCoreApplication4execEv (libQt5Core.so.5 + 0x291219)
                                          #18 0x0000560bc138213b n/a (lxqt-powermanagement + 0xb13b)
                                          #19 0x00007f9eaaa3c790 n/a (libc.so.6 + 0x23790)
                                          #20 0x00007f9eaaa3c84a __libc_start_main (libc.so.6 + 0x2384a)
                                          #21 0x0000560bc1382725 _start (lxqt-powermanagement + 0xb725)
                                          
                                          Stack trace of thread 592842:
                                          #0  0x00007f9eaab139df __poll (libc.so.6 + 0xfa9df)
                                          #1  0x00007f9eaa98553f n/a (libglib-2.0.so.0 + 0xb753f)
                                          #2  0x00007f9eaa926382 g_main_context_iteration (libglib-2.0.so.0 + 0x58382)
                                          #3  0x00007f9eab2d8c6c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d8c6c)
                                          #4  0x00007f9eab2866ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2866ec)
                                          #5  0x00007f9eab0e725f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe725f)
                                          #6  0x00007f9eac50ecba n/a (libQt5DBus.so.5 + 0x23cba)
                                          #7  0x00007f9eab0e432a n/a (libQt5Core.so.5 + 0xe432a)


(gdb) where
#0  LXQt::ScreenSaverPrivate::isScreenSaverLocked() (this=0x560bc251d6b0) at /tmp/liblxqt/lxqtscreensaver.cpp:196
#1  0x00007f9eac7b2d8c in LXQt::ScreenSaver::lockScreen() (this=0x560bc24ef6a8) at /tmp/liblxqt/lxqtscreensaver.cpp:253
#2  0x0000560bc1385e42 in  ()
#3  0x00007f9eab2bea71 in  () at /usr/lib/libQt5Core.so.5
#4  0x0000560bc1382a14 in  ()
#5  0x0000560bc138387f in  ()
#6  0x00007f9eac54c45f in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f9eab2b1bb0 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#8  0x00007f9eabf78b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#9  0x00007f9eab28df48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#10 0x00007f9eab28ea53 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#11 0x00007f9eab2d4e88 in  () at /usr/lib/libQt5Core.so.5
#12 0x00007f9eaa928afb in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#13 0x00007f9eaa9855d9 in  () at /usr/lib/libglib-2.0.so.0
#14 0x00007f9eaa926382 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#15 0x00007f9eab2d8c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#16 0x00007f9eab2866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007f9eab291219 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#18 0x0000560bc138213b in  ()
#19 0x00007f9eaaa3c790 in  () at /usr/lib/libc.so.6
#20 0x00007f9eaaa3c84a in __libc_start_main () at /usr/lib/libc.so.6
#21 0x0000560bc1382725 in _start ()

Session doesn't crash, and lxqt-config-monitor does not start and crash too.

[stefonarch]

Also lxqt/lxqt-powermanagement#342 is present again, it was solved in the previous PR.

[tsujan]

Also lxqt/lxqt-powermanagement#342 is present again, it was solved in the previous PR.

This PR includes the previous one; it just adds lxqt-config-monitor to the exception list.

Are you sure that you've compiled/tested the correct branch?

[stefonarch]

Are you sure that you've compiled/tested the correct branch?

Yes. But recompiled to be sure and now the crash is gone. But didn't switch branches...

[stefonarch]

ok, it looks like the crash happens only if "lock screen on lid close" is checked in lxqt-config-powermanagement. Will recheck the other PR, there it was fixed.

[tsujan]

Will recheck the other PR, there it was fixed.

I don't think it was. More probably, you've found another source of crash on Wayland.

[stefonarch]

What is strange: I change settings from in "lid action" from "suspend" to "lock screen" or vice-versa and it activates the new setting only at the 2nd lid closure. Will do more tests. Btw "Ask" is still there as an option for "lid close action".

[tsujan]

Oh, the last crash is the same as in your other report: lxqt/lxqt-powermanagement#342. It isn't related to lxqt-session.

[stefonarch]

Yes. I tested again #468 and it looks that I was wrong about lxqt/lxqt-powermanagement#342 : it was not solved there too.

[stefonarch]

Session crash at suspend is prevented and no records of coredumps for lxqt-config-monitor too.